Probably because here she was in 2015, sending Epstein xoxoxo's, and not refuting anything about the press release Epstein appears to be constructing for her, and appearing to be participating in his drafting of her version of the story. When she is clearly an adult at the time.
I note with some interest that Epstein sounds very confident in his assertions that Virginia Giuffre is a liar, at least regarding stuff she was publicly alleging that was concurrent with these emails. I know 2015 is around when she sued Maxwell for defamation so I'd guess it was part of some public statements surrounding that lawsuit from Guiffre.
I enquired with AI with regards to whether Epstein ever slipped up in the emails and expressed to anybody that he was worried about what she knew, what goods she might have on him, etc. The answer was no, he never varied from the stance that Guiffre was a liar, to anyone, nor seemed to be worried about her claims except in the PR sense of things.
Anyways, reading this stuff I think that Epstein was diabolical in creating a paper trail like this, and also maybe realize why prosecutors were seemingly hesitant to go after the guy in a criminal sense. Messages like these are golden for defense lawyers because then they could portray the victim as a "willing participant" and/or "jilted lover" type of deal, and the fact that he never once waivers from referring to Guiffre as a liar is also what a defense lawyer hopes to see in the records (and the prosecutors hope they don't see).
This exchange also constitutes evidence that prosecutors will need to look into. Epstein probably picked one thing he knew Guiffre couldn't possibly prove, and put it here, so that if someday the law did come DID come looking, they'd find there's this one story she maybe fabricated, so they'd have to think twice about using her as a witness against him at all.
One thing is certain, no known records (flight manifests or secret service records) nor testimony of others has ever been released to back up VG's claim of meeting Clinton at the island, and Big Dog flatly denies having been to the island at all. Nor did VG claim any sort of misconduct by Clinton when she did supposedly meet him.